reverse engineer a LED light bulb

Approximately one month ago, an attempt was made to reverse engineer a low-cost LED color-changing light bulb. With assistance, the circuit has been mapped out, and control over the bulb has been established. However, several aspects of this device remain unclear.

The LED color-changing light bulb typically consists of several key components: a microcontroller, LED drivers, RGB LEDs, and a power supply circuit. The microcontroller serves as the central processing unit, controlling the timing and intensity of the LEDs. It may be programmed to produce various color patterns by adjusting the duty cycle of the PWM (Pulse Width Modulation) signals sent to the RGB LEDs.

The LED drivers are responsible for supplying the appropriate voltage and current to the LEDs, ensuring they operate within safe limits. Often, these drivers include constant current sources to prevent damage due to thermal runaway. The RGB LEDs are arranged in a way that allows for the mixing of red, green, and blue light to create a wide spectrum of colors.

The power supply circuit typically consists of a rectifier, filter capacitors, and a voltage regulator. This section converts the AC mains voltage to a lower DC voltage suitable for the microcontroller and LED drivers. Additionally, safety features such as fuses or circuit breakers may be included to protect against overcurrent conditions.

To further understand the remaining mysteries of the circuit, it may be beneficial to analyze the communication protocols used (if any), such as I2C or SPI, which could be employed for remote control or synchronization with other devices. Additionally, examining the thermal management aspects, such as heat sinks or thermal pads, is crucial for ensuring long-term reliability and performance of the LED bulb.

Overall, thorough analysis of the circuit layout and component specifications will aid in uncovering the remaining unknowns associated with the LED color-changing light bulb.Almost a month ago I started trying to reverse engineer an inexpensive LED color changing light bulb. With your help I`ve mapped out the circuit, and taken control of the bulb. But there`s still a few mysteries in this little blinker.. 🔗 External reference